HTTP field names (IANA registry)

Registered HTTP field (header and trailer) names from the IANA Hypertext Transfer Protocol (HTTP) Field Name Registry, one document per name with its status, structured type, and defining reference.

Browse 259 documents Use with your agent

Documents

Showing 1–24 of 259 documents

Document	Version
* * is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
A-IM A-IM is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept Accept is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Additions Accept-Additions is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-CH Accept-CH is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Charset Accept-Charset is a deprecated HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Datetime Accept-Datetime is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Encoding Accept-Encoding is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Features Accept-Features is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Language Accept-Language is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Patch Accept-Patch is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Post Accept-Post is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Query Accept-Query is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Ranges Accept-Ranges is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Accept-Signature Accept-Signature is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control Access-Control is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Allow-Credentials Access-Control-Allow-Credentials is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Allow-Headers Access-Control-Allow-Headers is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Allow-Methods Access-Control-Allow-Methods is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Allow-Origin Access-Control-Allow-Origin is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Expose-Headers Access-Control-Expose-Headers is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Max-Age Access-Control-Max-Age is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Request-Headers Access-Control-Request-Headers is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Access-Control-Request-Method Access-Control-Request-Method is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1

Source, review, and usage

Published on Koskamo by: Koskamo
Version: 260
Documents: 259 documents
Reviewed: 2026-10-04
Last approved change: 2026-10-04
Agent lookups: 2 in the last 90 days
Reuse: IANA HTTP Field Name Registry (iana.org/assignments/http-fields); registry data reproduced verbatim with references
Review status: Published by Koskamo; proposed revisions require Koskamo approval

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

Use this dataset from an agent

Agents can query it without an account. POST to /api/v1/retrieve, or connect an MCP client and call koskamo_retrieve with dataset: "http-field-names".

Set up your agent Read documents as JSON

The JSON endpoint returns document text and source links in pages. Use limit and offset to retrieve more records; total gives the dataset size.

retrieve request

curl --fail-with-body 'https://koskamo.com/api/v1/retrieve' -H 'Content-Type: application/json' --data-raw '{"query":"http-field-names","dataset":"http-field-names","top_k":3}'

Change history

Every change that reached this dataset. Proposals from contributors land only after Koskamo approves them.

Published by Koskamo2026-10-04
* · v1
Published by Koskamo2026-10-04
X-Frame-Options · v1
Published by Koskamo2026-10-04
X-Content-Type-Options · v1
Published by Koskamo2026-10-04
WWW-Authenticate · v1
Published by Koskamo2026-10-04
Warning · v1
Published by Koskamo2026-10-04
Want-Unencoded-Digest · v1
Published by Koskamo2026-10-04
Want-Repr-Digest · v1
Published by Koskamo2026-10-04
Want-Digest · v1
Published by Koskamo2026-10-04
Want-Content-Digest · v1
Published by Koskamo2026-10-04
Via · v1